After North Korea’s nuclear bomb test Wednesday, there’s no cause for Guam to worry about radioactive dust, a meteorologist said Thursday.

The test was conducted underground, and even if the explosion kicked up dust into the air, U.S. National Weather Service senior meteorologist Mike Middlebrooke said, Guam isn’t in the path of wind from North Korea.

While Guam occasionally gets haze as a result of polluted air from Asia, Middlebrooke said there’s no chance that wind trajectory from North Korea will blow toward Guam.

The White House and U.S. geologists have confirmed that Wednesday’s 5.1 earthquake in North Korea was the result of an underground nuclear explosion. However, the White House is skeptical of North Korea’s claim the explosion was from a more powerful hydrogen bomb.

“The initial analysis that’s been conducted of the events that were reported overnight is not consistent with North Korean claims of a successful hydrogen bomb test,” stated White House Press Secretary Josh Earnest, in a transcript of a press briefing Thursday, Guam time. “Any kind of nuclear test like the one that North Korea conducted ... is provocative.”

Guam officials are concerned about further escalation of tension involving North Korea because the rogue state has specifically made threats about launching missiles aimed at Guam and U.S. military bases in Japan and South Korea. As a result of North Korea’s threats, the Pentagon deployed a mobile, truck-mounted missile defense system to Guam, called Terminal High Altitude Area Defense.

“Military officials have reassured the governor that the THAAD units deployed to Guam in 2013 stand ready to defend the island against incoming missile threats,” according to a statement from Oyaol Ngirairikl, director of communications for Gov. Eddie Calvo. “While there are no known threats at this time, they remain watchful.”

“I expect military leadership reassurance on their initial assertions: The military’s large presence in Guam would place the military in a better position to defend not just the rest of the United States, but also to better defend Guam.” said Speaker Judith Won Pat. “We were initially assured that the military presence in Guam was strategically located because it would reduce military reaction time. This also meant that military interception would take less time, thereby increasing Guam’s safety.”

Guam Delegate Madeleine Bordallo said she has met with Navy Secretary Ray Mabus and other Pentagon officials, who made her feel confident about the military’s safeguards in Guam.

Bordallo said she also met with Chief of Naval Operations Adm. John Richardson, and Commandant of the Marine Corps Gen. Robert Neller.

Guam’s Homeland Security and Office of Civil Defense are working with their partners at the Department of Defense, according to the governor’s statement.

A hydrogen bomb is about 1,000 times more powerful than the atomic bombs launched from U.S. military aircraft in World War II from a former base in Tinian island in the Northern Marianas, according to experts quoted in National Public Radio and wire reports. The United States dropped the bombs on the Japanese cities of Hiroshima and Nagasaki during World War II.

Geologists with the U.S. Geological Survey have classified the 5.1 magnitude earthquake in North Korea Wednesday as something caused by a nuclear explosion. However, experts quoted by National Public Radio said the result of the explosion fell short of the tremor that would be expected from a hydrogen bomb.

Although the test was conducted underground, tiny quantities of radioactive xenon gas could be picked up by detectors hundreds or even thousands of miles away, according to NPR.

A U.S. hydrogen bomb test in March 1954 conducted at Bikini Atoll in the Marshall Islands was 11 megatons, or roughly 1,000 times more powerful than North Korea’s test on Wednesday, NPR reported.

U.S. hydrogen bomb testing in the Marshall Islands prompted the relocation of Marshallese residents to the U.S. mainland and some of them to the Marianas.

A Guam group called Pacific Association of Radiation Survivors has also spent years trying to include Guam cancer victims in the compensation program for victims of the hydrogen bomb testing in the Marshall Islands.